JPS63156604A - Milling method - Google Patents

Abstract

PURPOSE:To make roughing performable as well as to aim at the promotion of efficiency for deep recess machining by means of an end mill, by tilting a spindle head supporting a face milling cutter to some extent, while interlocking an axial movement of the spindle head with each movement in both X-axis and Y-axis directions. CONSTITUTION:A support 2 is reciprocated in a Y-axis direction, a table 9 is moved in an X-axis direction, and the inside of a flat surface is machined by a face milling cutter 7. And, a spindle head 5 is moved in a Z-axis direction at pitch feed, machined to the extent of a bottom part, then movement of the Z-axis direction is interlocked with movement of the X-axis direction, and the face milling cutter 7 is interlocked by controlling a table driving servomotor and a spindle head driving servomotor 3a so as to make a workpiece move to the inside of a vertical surface in the tilting direction of a spindle. With this constitution, an unmachined part 30 is machinable by the face milling cutter 7 without lengthening a shank 6, thus a recess part 20 is also machinable accurately with a short end mill.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a milling method particularly suitable for machining deep recesses.

(Prior art) When forming four parts of a deeply concave workpiece, such as a mold for an automobile bumper, by milling, it is recommended to use a face milling cutter with a large number of planted blades as a milling tool from the viewpoint of processing efficiency. Additionally, it is highly efficient. In this case, the third
As shown in the figure, with the spindle head 5 holding the shank 6 having the face milling cutter 7 at its tip, the spindle head 5 is
While moving in the axial direction (direction perpendicular to the page),
The workpiece 10 is moved in the X direction (horizontal direction in Fig. 3), and a predetermined depth of the plane is machined in the first stage 15).
Next, pick-feed the spindle head 5 in two axial directions (vertical direction in Fig. 3), process the second stage 16 in the same way, and then process the third stage, etc.
・・・・・・・・・Processing is performed step by step starting from the top.

The deeper the recess to be processed, the narrower the width (in the illustrated example, the length in the Become. The reason why unprocessed parts 30 are created at the corners is that when the face milling cutter 7 is lowered into the recess to process the corners, the spindle head 5 hits the upper corner 14 of the recess, making it impossible to process the corners. It is from.

Therefore, in order to prevent the unprocessed part 30 from becoming rusty, it is necessary to use a sufficiently long shank 6 so that the spindle head 5 does not hit the corner part 14.
As the shank 6 improves, it is inevitable that the shank 6 will bend, causing a chatter phenomenon and making cutting impossible with a face mill.

It is also conceivable to use a ball end mill 12 instead of the face milling cutter 7 to machine the unmachined part 30, but even in this case, since the diameter of the head of the tool is small, cutting can be done somehow, but the shank may be bent. In addition, efficient machining is not possible, the tool life is short, and cutting with 1σ precision cannot be expected.

(Objective of the Invention) The present invention was made in order to eliminate such conventional drawbacks, and it is possible to perform addition with high efficiency even on a deeply concave mold surface using a face milling cutter, and To provide a milling method capable of machining deep recesses without leaving unprocessed corners at corners.

(Structure of the Invention) This invention moves a tool or a workpiece in the X-Y axis direction to machine the inner or outer plane of the contour line, and then performs the above operation by performing pick feeding in the Z-axis direction. In a milling machine that repeatedly cuts three-dimensional shapes, the milling tool moves in a plane perpendicular to the inclination of the spindle head while holding the tool @ with the head tilted at a predetermined angle from the Z-axis direction. In this way, the spindle head is moved in two axial directions, and machining is performed while controlling the amount of movement in relation to the movement in the X-axis or Y-axis direction.

As a result, the face milling tool can now be used under the most suitable conditions for machining deep concave mold surfaces.

The second gist of the invention is to move the tool or the workpiece in the X-Y axis direction to process the inner or outer plane of the contour on the cap height line, and then perform pick feeding in the Z@h direction to process the above-mentioned In a milling machine that repeatedly performs cutting into three-dimensional shapes by repeating the following operations, after machining a deep concave part of a workpiece with a face miller leaving the bottom corners intact, the spindle head that holds the tool is cut at a predetermined angle from the Z-axis direction. In the tilted state, move the spindle head in the axial direction so that the milling tool can move in a plane perpendicular to the inclination of the spindle head. The above-mentioned corner portion is machined while being controlled according to the following relationship.

In the above configuration, the spindle head is tilted and the movement of the spindle head in the axial direction is linked with the movement in the X-axis and Y-axis directions, so that the tool moves along a plane perpendicular to the inclined spindle. Cutting with a milling cutter becomes possible, and machining can be performed efficiently without the spindle head hitting the corners of the recess.

(Example) In FIGS. 1 and 2, a holder 2 that reciprocates in the Y-axis direction along a guide 40 is attached to the upper part of the column 1. An F-axis head 5 (which reciprocates in the axial direction) is attached, and these are driven by servo motors 4a and 3a, respectively. A shank 6 having a face milling cutter 7 at its tip is held by the spindle head 5, and the drive motor 4 rotates the face milling cutter 7 together with the spindle head 5.The stylus 41 of the profiling cutter is also rotated in the same manner. It is configured to reciprocate in the X-axis direction and the Z-axis direction.

By moving this stylus 41 along a model (not shown), the face milling cutter 7 is configured to process one crop 10 in accordance with the movement.

Further, a table 9 that reciprocates in the X-axis direction along a guide 8 is arranged on the base 1a, and a model and a workpiece 10 are fixedly mounted on this table 9.

This table 9 is driven by a servo motor (not shown).

In order to machine the concave portion of the workpiece 10 using the apparatus configured as described above, first, as in the conventional case, the holder 2 is reciprocated in the Y-axis direction along the guide 40, and the table 9 is moved in the X-axis direction along the guide 8. The face milling cutter 7 is rotated by the drive motor 4 while moving to perform cutting in the plane, and the spindle head 5 is pick fed in the Z-axis direction along the guide 3.
This process is repeated until the bottom part is processed by sequentially processing the first stage 15, the second stage 16, and the third stage 17 in FIG. This processing leaves an unfinished portion 30 at the bottom corner of the recess 20.

Next, as shown in the imaginary line in FIG.
tilt with If the workpiece 10 is moved in the X-axis direction by moving the table 9 in this state, the spindle head 5 will not come into contact with the corner 14 of the workpiece even if the tool does not protrude for a long time, but the face milling cutter 7 It hits diagonally against the
The bottom surface of the tool, which has no cutting ability, will interfere with the workpiece. In this way, even if the spindle head 5 is moved in the X-axis and Y-axis directions as described above while it is in an inclined state,
Cutting with the face milling cutter 7 is not possible.

Therefore, the table is controlled by a control device (not shown) so that the movement in the Z-axis force direction is linked to the movement in the X-axis direction, and the workpiece is moved in a plane perpendicular to the direction of inclination of the main axis. The servo motor 3a for driving the spindle head 5 is controlled and interlocked with the servo motor 3a for driving the spindle head 5. That is, X
For example, when the workpiece 1 is moved in the axial direction in the state shown in FIG.
When moving the workpiece 10 to the right, the spindle head 5 is raised in the axial direction in response to the rightward movement iFJ+ a of the workpiece 10, and the face milling cutter 7 cuts a machined surface parallel to the bottom surface of the workpiece 10. so that

With this, the unprocessed part is machined in the first stage 31), then the spindle head 5 is pick fed in the direction of its axis', and the second stage 32 is similarly machined, and then the third stage 33, etc. ...
Then, face milling is performed step by step from the top. Therefore, in this machining, the spindle head 5 does not come into contact with the upper corner 14 of the recess 20, so the shank 6 does not need to be lengthened.
The face milling cutter 7 allows the blank part 30 to be completely machined. After rough-machining the unprocessed portion to a minimum in this manner, the surface of the recess 20 is further finished by a ball end mill. An end mill with a short shaft can be used in this finishing process as well, making it possible to perform processing with high efficiency and precision.

Although FIG. 3 shows the machining state of only the corner of one end of the workpiece 10, machining of the unmachined part 30 at the other corner or the machining of the corner of the part in one direction perpendicular to the unmachined part 30 is also possible. The spindle head 5 can also be machined by tilting the spindle head 5 in the same manner.

In addition, in the above embodiment, after machining the four parts of the workpiece in the usual manner, the unmachined part that occurs at the bottom corner is machined by tilting the spindle head. It can also be applied to machining workpieces with shapes that are difficult to machine by keeping the spindle head vertical and moving in the mutually perpendicular X, Y, and Z axes. Yes, the spindle head may be tilted from the beginning.

(Effects of the Invention) As explained above, in this invention, the main spindle head that holds the face milling cutter is tilted, and the movement of the main head in the axial direction is linked with the movement in the It enables rough machining with a milling cutter, and also enables finishing with a ball end mill7) [II] efficiently and accurately.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus embodying the present invention, FIG. 2 is a side view thereof, and FIG. 3 is an explanatory view showing the processing method of the present invention. DESCRIPTION OF SYMBOLS 1...Column, 2...Holding body, 3...Guide in Z-axis direction, 5...Spindle head, 6...Shank, 7...
・Front milling cutter, 8... Guide in the X-axis direction, 9...
Table, 10...]: Crop, 14... Corner of recess, 20... Recess, 30... Unprocessed part. Patent applicant: Toshi Hosoi, Michihito Akizen
Patent Attorney Etsushi Kotani Patent Attorney
1) Masamukai Patent Attorney Yasuo Itaya Figure 3

Claims (1)

[Claims] 1. Move the tool or workpiece in the X-Y axis direction to process the inner or outer plane of the contour line, and then repeat the above operation by feeding the pick in the Z-axis direction. In a milling machine that performs cutting into three-dimensional shapes, the spindle head that holds the tool is tilted at a predetermined angle from the Z-axis direction.
The spindle head is moved in the axial direction so that the milling tool moves in a plane perpendicular to the inclination of the spindle head, and processing is performed while controlling the amount of movement in relation to the amount of movement in the X-axis or Y-axis direction. A milling method characterized by: 2. Move the tool or workpiece in the X-Y axis direction to process the inner or outer plane of the contour line, then feed the pick in the Z-axis direction and repeat the above operation to cut the three-dimensional shape. In a milling machine that performs machining, after machining a deep recess in a workpiece with a face miller, leaving the bottom corners intact, the milling tool rotates the main shaft with the spindle head that holds the tool tilted at a predetermined angle from the Z-axis direction. The spindle head is moved in the Z-axis direction so as to move in a plane perpendicular to the inclination of the head, and the corner is processed while controlling the amount of movement in relation to the movement in the X-axis or Y-axis direction. A milling method characterized by performing the following steps.